<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>自身属性</title>
</head>
<body>
	<script type="text/javascript">
		var item;
		for(item in f ){
			if (f.hasOwnProperty(item)) {
				console.log(item);
			}
		}
	</script>
</body>
</html>